Figure 1

Setup. Sketch of the setup to sense the magnetic field of a CPW with a BEC. The ultracold atom cloud is situated at the center of the central conductor of the waveguide resonator. The geometry of the CPW ensures that its magnetic field is polarized in the x direction at the location of the BEC. The magnetic field \(B_{x}(t)\) of the CPW oscillates in time with an angular frequency of \(\omega _{\mathrm{CPW}}\) that is resonant with a magnetic dipole transition of the BEC atoms, and induces transitions from the trapped state into an untrapped one